ABSTRACT
Statistics is a branch of applied mathematics and differs from pure mathematics in that the values in statistics are approximations or estimates, but they certainly are not guesses. An exact value may be thought of as being one of the possible values that a variable may assume. In pure mathematics, there are only two possibilities: that the value has a certain value or it does not. In the first case the probability is 1, in that it is certain that the variable has that value and in the second it is zero, meaning that it is certain that the variable does not have that value.
